Consider again the four copying machines discussed in Problem 2.1.1. What is the expected number of copying

Question:

Consider again the four copying machines discussed in Problem 2.1.1. What is the expected number of copying machines in use at a particular moment in time?
Problem 2.1.1
An office has four copying machines, and the random variable X measures how many of them are in use at a particular moment in time. Suppose that P(X =0) =0.08. P(X = 1) = 0.11, P(X = 2) = 0.27, and P(X = 3) = 0.33.